I am going to try an aftermarket pair one my beater auto m54 x5. You use a cone thing or an air powered tool to make them expand and require very little removal of parts. Granted it is only for the one that is closest to the wheel but it looks like I can switch it out in 30 minutes. Some parts maker in the UK makes them. Since I have an air compressor I am going to buy the 134.00 tool so boot swapping will only take about 30 minutes or so. I am shocked the gnk boots failed so quickly.

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles